My chickens/ducks/turkey all share a pen and roost. The chickens all roost at night and the ducks sleep on the floor so it works out pretty good. You need a pretty wide roost for silkies or they'll sleep on the floor though, and then they'd be a huge mess from the ducks. I also have to keep my food and water in the run, about 100 feet from each other, to keep the ducks from making the coop wet and stinky. The drake will pull the chickens tails occasionally, and I've seen my roosters on top my ducks, but they mostly get along great.